Nuclear structure effects in sub-barrier fusion cross sections

Pengo, R.; Evers, D.; Löbner, K. E. G.; Quade, U.; Rudolph, K.; Skorka, S.J.; Weidl, I.

doi:10.1016/0375-9474(83)90392-5

Cited by 83 publications

(72 citation statements)

References 18 publications

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“…Broglia et al [29,30] suggested that the coupling to transfer channels with positive Q values is needed to explain the enhancement of fusion data for the Ni + Ni systems. Large enhancements of subbarrier fusion cross sections have been also observed in many other reaction systems with positive Q-value neutron transfer (PQNT) channels, such as the reaction systems 32 S + A Pd (A = 104-106, 108, and 110) [36], 40 Ca + 44,48 Ca [37], 40 Ca + 94,96 Zr [38,39], and 32 S + 94,96 Zr [40,41]. For some of these systems, the fusion excitation functions have been measured in sufficiently small energy steps, which can be used to extract the underlying barrier distributions to study the contribution from transfer channels.…”

Section: Introductionmentioning

confidence: 84%

“…However, with the NL3* interaction, the obtained β 2 's for 94 Zr and 96 Zr are 0.002 and 0.233, which are quite different. To solve this puzzling issue and get further understanding of the coupling to PQNT channels, we suggest to measure the fusion excitation function of the reactions 48 Ca + 94 Zr or 36 S + 94 Zr. In these two reactions, the PQNT channels are closed (see Table 1).…”

Section: The Issue Of Quadrupole Deformation For 94 Zrmentioning

confidence: 99%

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Theoretical study of fusion reactions 32S + 94,96Zr and 40Ca + 94,96Zr and quadrupole deformation of 94Zr

Wang

Zhao

et al. 2016

Sci. China Phys. Mech. Astron.

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Section: Introductionmentioning

confidence: 84%

Section: The Issue Of Quadrupole Deformation For 94 Zrmentioning

confidence: 99%

Theoretical study of fusion reactions 32S + 94,96Zr and 40Ca + 94,96Zr and quadrupole deformation of 94Zr

Wang

Zhao

et al. 2016

Sci. China Phys. Mech. Astron.

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“…Rather the prominent role of one-and two-neutron transfers in 6,8 He induced fusion reactions was definitively demonstrated. On the other hand, the effect of non-conventional transfer/stripping processes appears to be less significant for stable weakly bound projectiles.…”

Section: Introductionmentioning

confidence: 98%

“…Due to their very weak binding energies, a diffuse cloud of neutrons for 6 He or an extended spatial distribution for the loosely bound proton in 8 B would lead to larger total reaction (and fusion) cross sections at subbarrier energies as compared to 1D-BPM model predictions. This enhancement is well understood in terms of the dynamical processes arising from strong couplings to collective inelastic excitations of the target (such as "normal" quadrupole and octupole modes) and projectile (such as soft dipole resonances).…”

Section: Introductionmentioning

confidence: 99%

Coupled-Channel Effects in Collisions Between Heavy Ions Near the Coulomb Barrier

Beck¹

2013

Exciting Interdisciplinary Physics

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With the recent availability of state-of-the-art heavy-ion stable and radioactive beams, there has been a renew interest in the investigation of nuclear reactions with heavy ions. I first present the role of inelastic and transfer channel couplings in fusion reactions induced by stable heavy ions. Analysis of experimental fusion cross sections by using standard coupled-channel calculations is discussed. The role of multi-neutron transfer is investigated in the fusion process below the Coulomb barrier by analyzing 32 S+ 90,96 Zr as benchmark reactions. The enhancement of fusion cross sections for 32 S+ 96 Zr is well reproduced at sub-barrier energies by NTFus code calculations including the coupling of the neutron-transfer channels following the Zagrebaev semi-classical model. Similar effects for 40 Ca+ 90 Zr and 40 Ca+ 96 Zr fusion excitation functions are found. The breakup coupling in both the elastic scattering and in the fusion process induced by weakly bound stable projectiles is also shown to be crucial. In this lecture, full coupled-channel calculations of the fusion excitation functions are performed by using the breakup coupling for the more neutron-rich reaction and for the more weakly bound projectiles. I clearly demonstrate that Continuum-Discretized Coupled-Channel calculations are capable to reproduce the fusion enhancement from the breakup coupling in 6 Li+ 59 Co.

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“…The importance of neutron transfer with positive Q-values on nuclear fusion (capture) originates from the fact that neutrons are insensitive to the Coulomb barrier and therefore they can start being transferred at larger separations before the projectile is captured by target-nucleus [4]. Therefore, it is generally thought that the sub-barrier fusion cross section will increase [5][6][7] because of the neutron transfer. As suggested in Ref.…”

Section: Introductionmentioning

confidence: 99%

Role of neutron transfer and deformation effect in capture process at sub-barrier energies

Sargsyan¹,

Adamian²,

Antonenko³

et al. 2012

EPJ Web of Conferences

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Abstract. The roles of nuclear deformation and neutron transfer in sub-barrier capture process are studied within the quantum diffusion approach. The change of the deformations of colliding nuclei with neutron exchange can crucially influence the sub-barrier fusion. The sub-barrier capture reactions following the neutron pair transfer are used for the indirect study of neutron-neutron correlation in the surface region of nucleus. The strong surface enhancement of the neutron pairing in nuclei 48 Ca, 64 Ni, and 116,124,132 Sn is demonstrated. Comparing the capture cross sections calculated without the breakup effect and experimental complete fusion cross sections, the breakup was analyzed in reactions with weakly bound projectiles 6,7,9 Li and 9 Be. A trend of a systematic behavior for the complete fusion suppression as a function of the target charge and bombarding energy is not achieved.

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Nuclear structure effects in sub-barrier fusion cross sections

Cited by 83 publications

References 18 publications

Theoretical study of fusion reactions 32S + 94,96Zr and 40Ca + 94,96Zr and quadrupole deformation of 94Zr

Theoretical study of fusion reactions 32S + 94,96Zr and 40Ca + 94,96Zr and quadrupole deformation of 94Zr

Coupled-Channel Effects in Collisions Between Heavy Ions Near the Coulomb Barrier

Role of neutron transfer and deformation effect in capture process at sub-barrier energies

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